Metal-cutting tool.



'S. NEWBOLD.

METAL CUTTING TOOL. APPLICATION rum) DBO.4,1907:

899 ,608, Patented Sept. 29, 1908'.

mmsssss T I nwmron ATTORNEY UNITED AT FATE-i SIDNEY NEWBOLD, F PHILADELPHIA, PENNSYLVANIA.

No. aeaeos.

To all, whom 'it may concern: Y

currlngfrom the re eated shoe METAL-corms 'rooL.

Be it known that L'SIDNEY N EWBOLD, a citizen of the United. States of America, re sid' g in the city and county of Philadelphia, in the State of Pennsylvanla, have invented. a certain new'and useful Improvement in Metal-Cutting is a true'and exact description,reference being had to the accompanying drawings, which form a part thereof.

The present invention relates to devices, foradjustably clamping metaLoutting tools or cutters pro or in their holders, and is particularly applicable for use in'securing removable cutters or teeth in saw blades, though well adapted also for securing removable cutting tools in other varieties of holdingdevices. i

The object of the invention is the provision of simple and eflicient means for clamping the tools in the holders in such manner that the tools may be readilyjremoved and replaced or adjusted fromtime to,-time and maybe secured in place withthe desired rigidity after each ad'ustment or replacement.-

In particular, t e object of the invention is to provide clamping means so arr'angedthat' any deformation in the holdin parts, 00-

is to which the tools maybe su jected may be readily compensated forfrom time to" time. This object I obtain b fincluding inthe clamping means a thrust bibck divided into two parts and provided with a soft me'talfilling between the two parts of the block which ma be tam ed to spread the parts of the bloc as con ltions require.

The various-features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and formin a part ofthis s ecificationr For a better un erstanding of t e invention, however, andthe advantages possessed byit, refwhich it may be embodied.

erence may be had to the accompanyin drawngs and escriptivematter in which have illustrated and described one of Of the drawings, Figure 1 is a perspective view of a portion of a rotary metal cutting saw provided with plan taken on holder or saw blade proper, which is rovided wlth a'cavity A for each removab e tooth.

Specification o1 Letters Patent. Application filed December 4, 1907. Serial Hangman Tools, ofwhich the following D is adjusted grooves.

diametricall the forms in 4 and rear edges of the holder 0 can removable sawteeth. F g. 2 is an elevation of the same saw por- Patented-Sept. 29, 1908.

The saw tooth B, which may well be made, of high speed steel is machined to fit a correspondmgly shaped socket or space between the front and rear legs 0 and C of a su lemental or. .auxiliary U shaped tool holiibr C. The radial position of-the cutterB may be regulated by an adjustable bolt D threaded into the saw blade A at the bottom ofthe cavity A and having its head serving as an abutment against which the inner edge of the supplemental holder C bear The parts are clamped in position after the screw as desired by drivin a wedge E into place between the rear wal or ed e of-cavity A and the rear legC of the auxiliary holder C. By preference, the adjacent edges of the cavity A,

are provided with interlocking tongues and For instance, edges of the cavit' A are formed with tongues A, thewedge E with'a groove E and a tongue E the edges of the legs C" and C with grooves C tdngues B.

In the form of the invention disclosed, the front leg (1 of the holder C forms the two art'thrust block, being'slitted between its front and rear edges from its outer end to a point adjacent its inner end. The division of the leg into two parts is made by a sub-- stantiallyradial hole C drilled in the leg and opposed kerfs 0 extending from the ho e C to the side faces of the le Asoft'metal filling F is inserted in the hoie With this'arran ement the front and rear. edgesof the suppl emental holder can be broughtinto the proper relation from time to time by tam ing th filling of soft metal in the hole C an thereby expanding the two bifurcations of the front leg of the auxiliary holder. This operation may well be carried out in. a vise or tool setting device provided with a cavit fitted to the proper dimensions of the hoiiier, so that by a suitable tamping of thesoft metal filling F the front be given the exact re ation desired, and the tool. may thereafter be properly secured in place by driving the wedge onlsey E home.

I have found that with parts shaped as shown in the drawings there is but little, if

any greater, tendency for the legs of the su lemental holder to be deformed when t he rontleg is slittedand filled with soft metal than when th'isleiais made solid, since when the front and rear and the cutter B with wedge E, auxiliary I cutter'holder C," and cutter or saw teeth B the saw tooth, which practice has demonthe lierl's U" are thin, as they should be, the elongated pencil like lilli'ng it o'l s'ol't metal is but ditlicultly compressible under pressure applied to the front and rear edges of the leg 1. This notwithstanding the act that the legC may be readily expanded by tamping the filling F at its upper end. Whether the leg is slitted and rovided with a socket for the suit metal filling or is made solid, it is practically im ossible to avoid some drawing together 0 the outer ends oi the leg edges ol' the supplemental holder under the repeated shocks in -ident to use. With the present invention, however, this may be easily con'ipensated {or lrom. time to time by tamping the soft metal tilting to expand the two part front leg; at the same time the soft metal filling F provides a sort of cushion 'l'or strated that it is highly desirable for such a tooth to have.

Having now described my invention, what I claim as new and desire to secure by Let-. ters Patent is:

1.. The combination with a cutter holder having a cavity and a removable cutter of means for clamping the cutter or tooth in place in said cavity, includin a two part i thrust block and a soft metal filling between the two parts of the thrust block. 2. The combination with a "cutter holder l having a cavity-and a removable? cutter, of means for clamping the cutter in place in i said cavity, including a thrust block divided i into two parts by a hole extending into it from its outer end and diametrically opposed thin kerfs extending l'rom the hole to the side laces ol' the block, and a sol't metal filling tamped in place in said hole.

I). The combination with a rotary cutter holder having a iavity and a removable cutter, of a U shaped supplemental holder bw tween the legs of which the cut ler is received,

a wedge for clamping said auxiliary cutter holder with the inserted cutter in place in said cavity, the outer end of one leg ol' the auxiliary holder being divided into two mrts by a slit extending lengthwise oland between the front" and rear edges ol' said leg, and a soft metal lilling inserted in said slit.

4. The combination with a rotary cutter holder having a cavity and a removable cutter of a U shaped supplemental holder between the legs of which the cutter is received, a wedge to" clamping said auxiliary cutter holder with the inserted cutter in place in said cavi y, the outer end of one leg of the auxiliary holder being divided into two tarts by a slit extending lengthwise of and be: tween the front and rear edges of said leg, and a soft metal lilling inserted in'said slit, the meeting edges of said cavity in the main 'cutter holder, the wedge, the legs of the auxiliary cutter holder, and the cutter being provided with interlocking tongues and grooves.

SIDNEY NICWBOM). W'itnesses:

(J. W. COLEMAN,

(J. S. Biurrox. 

